Gassendi, Pierre, De proportione qua gravia decidentia accelerantur, 1646

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1Demonſtratio, qua ratio, menſura, modus, ac poten­
tia accelerationis motus in naturali deſcenſu grauium
determinantur; aduerſus nuper excogitatam à Galileo
Galilei Florentino Philoſopho, ac Mathematico de
eodem motu Pſeudo ſcientiam. Hæc ergo Epiſtola eſt,
ad quam heic primùm Respondetur. A pag.
1. in 3.
ART. II. III. IV. V. Status Controuerſiæ.
Quæritur nimirùm, An, cùm lapide, v. c. ex alto cadente,
accipere liceat primum quoddam spatium, vt vnam orgyiam;
& habe re pro momento, ſeu tempore primo illud quod effluit,
donec lapis per hanc orgyiam decidit: & pro gradu celeritatis
primo eam celeritatem, quæ in fine primi huius temporis acqui­
ſita eſt: An inquam, acceptis deinceps æqualibus ſpatijs, tempo­
ribus, & gradibus, cenſeri debeat lapis motuſ-ve ipſius tum
acquiſiiſſe duos celeritatis gradus, cùm eſt ſuperata ſecunda
orgyia, licet ſecundum tempus nondum totum effluxerit, ac
pari modo treis, cùm tertia, quatuor cum quarta, &c.
adeò vt
ſemper velocitates ſe habeant ſicut ſpatia, quòd R. P. conten­
dit: An potiùs cenſeride beat tum acquiſiiſſe duos celeritatis gra­
dus, cùm effluxit ſecundum tempus, licet plura spatia, quàm
duo ſuperata ſint: ac pari modo treis, cùm tertium, quatuor,
cùm quartum, &c.
adeò vt ſemper velocitates ſe habeant ſicut
tempora; quæ eſt Galilei ſententia.
Ex qua aliunde ſequitur,
vt temporibus æqualibus ſpatia ſuperentur iuxta numeros ab
vnitate impareis: ita vt ſi primo tempore lapis decidat per
vnam orgyiam, decidat ſecundo per treis, tertio per quinque,
quarto per ſeptem, &c.
atque idcircò spatia in fine cuiuſque
temporis à principio vſque aggregata habeant ſe ſicut quadra­
ta temporum; hoc eſt, vt spatia ſuperata ſint in fine vnius

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